Add support for multiple V4L2 video devices of the same type.

media/gpu/v4l2_video_decode_accelerator.cc

Index: media/gpu/v4l2_video_decode_accelerator.cc
diff --git a/media/gpu/v4l2_video_decode_accelerator.cc b/media/gpu/v4l2_video_decode_accelerator.cc
index 86a73cc53abd88f953fe7226a31b6e94225cfa7d..2a1ce1a78e942f4577f073fbca4b70cbaff56401 100644
--- a/media/gpu/v4l2_video_decode_accelerator.cc
+++ b/media/gpu/v4l2_video_decode_accelerator.cc
@@ -178,6 +178,7 @@ V4L2VideoDecodeAccelerator::V4L2VideoDecodeAccelerator(
       get_gl_context_cb_(get_gl_context_cb),
       make_context_current_cb_(make_context_current_cb),
       video_profile_(VIDEO_CODEC_PROFILE_UNKNOWN),
+      input_format_fourcc_(0),
       output_format_fourcc_(0),
       egl_image_format_fourcc_(0),
       egl_image_planes_count_(0),
@@ -202,13 +203,6 @@ bool V4L2VideoDecodeAccelerator::Initialize(const Config& config,
   DCHECK(child_task_runner_->BelongsToCurrentThread());
   DCHECK_EQ(decoder_state_, kUninitialized);
 
-  if (!device_->SupportsDecodeProfileForV4L2PixelFormats(
-          config.profile, arraysize(supported_input_fourccs_),
-          supported_input_fourccs_)) {
-    DVLOGF(1) << "unsupported profile=" << config.profile;
-    return false;
-  }
-
   if (config.is_encrypted) {
     NOTREACHED() << "Encrypted streams are not supported for this VDA";
     return false;
@@ -256,6 +250,15 @@ bool V4L2VideoDecodeAccelerator::Initialize(const Config& config,
     DVLOGF(1) << "No GL callbacks provided, initializing without GL support";
   }
 
+  input_format_fourcc_ =
+      V4L2Device::VideoCodecProfileToV4L2PixFmt(video_profile_, false);
+
+  if (!device_->Open(V4L2Device::Type::kDecoder, input_format_fourcc_)) {
+    DVLOGF(1) << "Failed to open device for profile: " << config.profile
+              << " fourcc: " << std::hex << "0x" << input_format_fourcc_;
+    return false;
+  }
+
   // Capabilities check.
   struct v4l2_capability caps;
   const __u32 kCapsRequired = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
@@ -721,7 +724,7 @@ bool V4L2VideoDecodeAccelerator::TryToSetupDecodeOnSeparateThread(
 // static
 VideoDecodeAccelerator::SupportedProfiles
 V4L2VideoDecodeAccelerator::GetSupportedProfiles() {
-  scoped_refptr<V4L2Device> device = V4L2Device::Create(V4L2Device::kDecoder);
+  scoped_refptr<V4L2Device> device = V4L2Device::Create();
   if (!device)
     return SupportedProfiles();
 
@@ -1960,11 +1963,11 @@ bool V4L2VideoDecodeAccelerator::CreateBuffersForFormat(
   coded_size_.SetSize(format.fmt.pix_mp.width, format.fmt.pix_mp.height);
   visible_size_ = visible_size;
   if (image_processor_device_) {
-    V4L2ImageProcessor processor(image_processor_device_);
     egl_image_size_ = visible_size_;
     egl_image_planes_count_ = 0;
-    if (!processor.TryOutputFormat(egl_image_format_fourcc_, &egl_image_size_,
-                                   &egl_image_planes_count_)) {
+    if (!V4L2ImageProcessor::TryOutputFormat(
+            output_format_fourcc_, egl_image_format_fourcc_, &egl_image_size_,
+            &egl_image_planes_count_)) {
       LOGF(ERROR) << "Fail to get output size and plane count of processor";
       return false;
     }
@@ -2068,16 +2071,9 @@ bool V4L2VideoDecodeAccelerator::SetupFormats() {
   DCHECK(!input_streamon_);
   DCHECK(!output_streamon_);
 
-  __u32 input_format_fourcc =
-      V4L2Device::VideoCodecProfileToV4L2PixFmt(video_profile_, false);
-  if (!input_format_fourcc) {
-    NOTREACHED();
-    return false;
-  }
-
   size_t input_size;
   gfx::Size max_resolution, min_resolution;
-  device_->GetSupportedResolution(input_format_fourcc, &min_resolution,
+  device_->GetSupportedResolution(input_format_fourcc_, &min_resolution,
                                   &max_resolution);
   if (max_resolution.width() > 1920 && max_resolution.height() > 1088)
     input_size = kInputBufferMaxSizeFor4k;
@@ -2089,7 +2085,7 @@ bool V4L2VideoDecodeAccelerator::SetupFormats() {
   fmtdesc.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
   bool is_format_supported = false;
   while (device_->Ioctl(VIDIOC_ENUM_FMT, &fmtdesc) == 0) {
-    if (fmtdesc.pixelformat == input_format_fourcc) {
+    if (fmtdesc.pixelformat == input_format_fourcc_) {
       is_format_supported = true;
       break;
     }
@@ -2097,7 +2093,7 @@ bool V4L2VideoDecodeAccelerator::SetupFormats() {
   }
 
   if (!is_format_supported) {
-    DVLOGF(1) << "Input fourcc " << input_format_fourcc
+    DVLOGF(1) << "Input fourcc " << input_format_fourcc_
               << " not supported by device.";
     return false;
   }
@@ -2105,7 +2101,7 @@ bool V4L2VideoDecodeAccelerator::SetupFormats() {
   struct v4l2_format format;
   memset(&format, 0, sizeof(format));
   format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
-  format.fmt.pix_mp.pixelformat = input_format_fourcc;
+  format.fmt.pix_mp.pixelformat = input_format_fourcc_;
   format.fmt.pix_mp.plane_fmt[0].sizeimage = input_size;
   format.fmt.pix_mp.num_planes = 1;
   IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_S_FMT, &format);
@@ -2123,11 +2119,11 @@ bool V4L2VideoDecodeAccelerator::SetupFormats() {
     ++fmtdesc.index;
   }
 
+  DCHECK(!image_processor_device_);
   if (output_format_fourcc_ == 0) {
     DVLOGF(1) << "Could not find a usable output format. Try image processor";
-    image_processor_device_ = V4L2Device::Create(V4L2Device::kImageProcessor);
-    if (!image_processor_device_) {
-      DVLOGF(1) << "No image processor device.";
+    if (!V4L2ImageProcessor::IsSupported()) {
+      DVLOGF(1) << "Image processor not available";
       return false;
     }
     output_format_fourcc_ = FindImageProcessorInputFormat();
@@ -2140,6 +2136,11 @@ bool V4L2VideoDecodeAccelerator::SetupFormats() {
       LOGF(ERROR) << "Can't find a usable output format from image processor";
       return false;
     }
+    image_processor_device_ = V4L2Device::Create();
+    if (!image_processor_device_) {
+      DVLOGF(1) << "Could not create a V4L2Device for image processor";
+      return false;
+    }
     egl_image_device_ = image_processor_device_;
   } else {
     if (output_mode_ == Config::OutputMode::IMPORT) {
@@ -2163,9 +2164,9 @@ bool V4L2VideoDecodeAccelerator::SetupFormats() {
 }
 
 uint32_t V4L2VideoDecodeAccelerator::FindImageProcessorInputFormat() {
-  V4L2ImageProcessor image_processor(image_processor_device_);
   std::vector<uint32_t> processor_input_formats =
-      image_processor.GetSupportedInputFormats();
+      V4L2ImageProcessor::GetSupportedInputFormats();
+
   struct v4l2_fmtdesc fmtdesc;
   memset(&fmtdesc, 0, sizeof(fmtdesc));
   fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
@@ -2173,7 +2174,7 @@ uint32_t V4L2VideoDecodeAccelerator::FindImageProcessorInputFormat() {
     if (std::find(processor_input_formats.begin(),
                   processor_input_formats.end(),
                   fmtdesc.pixelformat) != processor_input_formats.end()) {
-      DVLOGF(1) << "Image processor input format=" << fmtdesc.pixelformat;
+      DVLOGF(1) << "Image processor input format=" << fmtdesc.description;
       return fmtdesc.pixelformat;
     }
     ++fmtdesc.index;
@@ -2195,9 +2196,8 @@ uint32_t V4L2VideoDecodeAccelerator::FindImageProcessorOutputFormat() {
     return iter_a < iter_b;
   };
 
-  V4L2ImageProcessor image_processor(image_processor_device_);
   std::vector<uint32_t> processor_output_formats =
-      image_processor.GetSupportedOutputFormats();
+      V4L2ImageProcessor::GetSupportedOutputFormats();
 
   // Move the preferred formats to the front.
   std::sort(processor_output_formats.begin(), processor_output_formats.end(),
@@ -2351,9 +2351,13 @@ bool V4L2VideoDecodeAccelerator::CreateOutputBuffers() {
 
 void V4L2VideoDecodeAccelerator::DestroyInputBuffers() {
   DVLOGF(3);
-  DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
+  DCHECK(!decoder_thread_.IsRunning() ||
+         decoder_thread_.task_runner()->BelongsToCurrentThread());
   DCHECK(!input_streamon_);
 
+  if (input_buffer_map_.empty())
+    return;
+
   for (size_t i = 0; i < input_buffer_map_.size(); ++i) {
     if (input_buffer_map_[i].address != NULL) {
       device_->Munmap(input_buffer_map_[i].address,
@@ -2374,10 +2378,14 @@ void V4L2VideoDecodeAccelerator::DestroyInputBuffers() {
 
 bool V4L2VideoDecodeAccelerator::DestroyOutputBuffers() {
   DVLOGF(3);
-  DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
+  DCHECK(!decoder_thread_.IsRunning() ||
+         decoder_thread_.task_runner()->BelongsToCurrentThread());
   DCHECK(!output_streamon_);
   bool success = true;
 
+  if (output_buffer_map_.empty())
+    return true;
+
   for (size_t i = 0; i < output_buffer_map_.size(); ++i) {
     OutputRecord& output_record = output_buffer_map_[i];